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- Title
Solution‐Processed Wafer‐Scale Ag<sub>2</sub>S Thin Films: Synthesis and Excellent Charge Transport Properties.
- Authors
Wang, Junren; Fu, Shuai; Zhang, Heng; Graf, Robert; Halim, Henry; Chen, Shuai; Zheng, Wenhao; Bonn, Mischa; Landfester, Katharina; Riedinger, Andreas; Wang, Hai I.
- Abstract
Monoclinic α‐Ag2S is an intriguing member of transition metal sulfides with great potential for all‐inorganic flexible optoelectronics and thermoelectrics. Fabrication of large‐area, high‐quality α‐Ag2S thin films and understanding their charge transport properties are critical for device operations yet have remained largely unexplored. Here, a novel two‐step, the solution‐processed approach is reported to produce wafer‐sized, highly crystalline α‐Ag2S thin films. Ultrafast terahertz (THz) conductivity measurements reveal that photogenerated charge carriers undergo efficient band transport, with room‐temperature mobility of ≈150 cm2 V‐1 s‐1 and a diffusion length exceeding 500 nm. Furthermore, introducing poly(vinyl alcohol) (PVA) as the rigid component into the aqueous silver thiolate precursor enables the synthesis of free‐standing α‐Ag2S thin films with a mobility of ≈35 cm2 V‐1 s‐1, demonstrating their potential for flexible optoelectronics. This study provides a facile synthesis route for high‐quality, large‐area α‐Ag2S thin films with good charge transport properties, relevant for their integration into optoelectronics and wearable electronics.
- Subjects
THIN films; POLYVINYL alcohol; METAL sulfides; CHARGE carriers; WEARABLE technology; TRANSITION metals
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 28, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202113147